Core drill



CORE DRILL Filed May 5, 1924 Patented Mar. 2, 1926.

UNITED STA TES PATENT OFFICE.

SVEN T. NELSON, OF MICHIGAN CITY, INDIANA, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

oona DRILL.

Application filed May 5,

To all whom it may concern:

Be it known that I, SVEN T. NnLsoN, a citizen of the United States, residing at Michigan City, inthe county of La Porto and State of Indiana, have invented certain new and useful Improvements in Core Drills, of which the following is a full, clear, and exact specification.

My invention relates to core drills.

An object of my invention is to provide an im roved core lifter mechanism for such a dril A further object of my invention is to provide an improved core lifter mechanism having great elasticity and strength permitting the free passage of the core during drilling, .yet rigidly gripping the core when the latter is raised from the hole. Still another object of my invention is to provide an improved core lifter mechanism especially adapted to act on cores of a soft or worn character.

In the accompanying drawings I have shown for purposes of illustration three forms which my invention may assume in practice. In these drawings,

Fig. 1 is a central longitudinal sectional view through a core barrel and drill bit in which my improved core lifter mechanism is incorporated, the lifter section being on line 11 of Fig. 2.

Fig. 2 is a plan view, partially broken away to facilitate illustration, of my improved core lifter.

Fig. 3 is a side elevation, partially broken away, of Fig. 2.

Fig. 4 is a fragmentary view of the spring member.

Fig. 5 is a plan view of a modified form of construction, the view being partially shown in sections.

Fig. 6 is a detail sectional view of a further modified form of construction.

In the illustrative form of my invention shown in Figs. 1 to 3, I have shown a hollow core barrel 1 threadedly connected as at 2 to the upper end of a core lifter casing or shell 3 which is in turn threadedly connected at its lower end as at 4 to a core drill bit 5, herein of the usual rotary diamond type. The core lifter casing 3 is provided with an internal conical bore 6 in which a core lifter, generally designated 7, of improved form is disposed.

In my improved construction it will be- 1924. Serial No. 710,966.

observed that the core lifter 7 comprises a plurality of radially spaced wedge members 8 having inclined surfaces 9 on their outer periphery, adapted to cooperate with, the surface 6 formed in the casing 3. These wedges are herein also provided with outwardly inclined surfaces 10 formed at their lower inner edges which direct the core through vertical concave surfaces'll formed on the wedges forming an annular core passage 12 leading upwardly into the hollow core barrel 1. These wedges are also vertically arcuately slotted as at 13 and in these slots an annular radially expanding spring member 14 is disposed which is provided at its lower edge with a plurality of radially spaced slots or notches 15 which engage abutment portions 16 (see Fig. 3) formed on the wedges, thereby preventing radial displacement of the latter. This radially expending member 14 is herein also rigidly xed to the wedges 8 in any suitable manner, herein by spot welding, as at 17 and is split as at 18 to permit ready expansion and contraction thereof.

In the form of 'my invention shown in Fig. 5, the spring member 14 is provided with flattened surfaces 19 which are received in straight vertical slots 20 formed in the wedges 21 and are rigidly held therein as by spot welding. In the form of my invention shown in Fig. 6 the radially expanding member 14 is rigidly secured to each wedge member 22 by means of a separate plate 23 held in position by rivets 24 and 25, the latter being headed or peened over in counterbores 26 formed in the inner surface of the plate 23 and the outer surface of the wedge 22, thereby permitting a very strong structure to be obtained.

While I have in this application specifically described three forms which m invention may assume in practice, it will be having vertical slots formed therein, and

spring means carried in said slots.

4. A core lifter comprising spaced wedges having vertical slots formed therein, and radially expanding spring means carried in said slots.

5. A core lifter comprising spaced wedges havin vertical slots formed therein, and radial y expanding spring means carried in said slots and rigidly secured therein.

6. A core lifter comprising spaced wedges having longitudinally extending slots formed therein, spring means disposed in said slots, and means carried by said wedges for preventing lateral displacement thereof.

7. A core lifter comprising spaced wedges having arcuate longitudinally extending slots formed therein, and resilient means carried in said slots connecting said wedges.

8. A core lifter comprising spaced wedges having arcuate longitudinally extending slots formed therein, and split resilient means carried in said slots and welded thereto connecting said wedges.

9. A core lifter comprising separate spaced wedge shaped core engaging members, a resilient supporting mem er having notches formed therein within which portions of said wedge members project, and means for rigidly securing each wedge member to said member.

10. A core lifter comprising separate spaced core engaging wedges having slots formed therein, a resilient split supporting member disposed in said slots and having notches within which portions of said wedge members project, and means for rigidly securing each wedge member to said member.

11. A core lifter comprising separate spaced wedge shaped core engaging members having projecting portlons, a split spring carried by said wedge members, the projecting portions thereon overlapping said spring, and means for rigidly securing each wedge member to said spring.

12. A core lifter comprising separate spaced wedge shaped core engaging members, a supporting spring therefor having a notched edge, said notches preventing lateral displacement of said wedge members, and means for rigidly securing each wedge member to said spring.

13.- A core lifter comprising separate spaced wedge shaped core engaging members each having an inwardly inclined core guiding surface and a longitudinally extending slot, a split resilient member disposed in said slots, and means for rigidly securing each wedge member to said resilient member.

14. A core lifter comprising separate spaced wedge shaped core engaging members each having a vertical slot, a split resilient member disposed in said slots and having notches formed therein, a portion on said wedge members projecting within said notches, and means for rigidly securing each wedge member to said resilient member.

In testimony whereof I affix my signature.

SVEN T. NELSON. 

